The Deming Luna Mimbres Museum proudly displays a world-class exhibit of Thundereggs, Geodes, and Nodules donated by Robert (Paul) Colburn of the Basin Range Volcanics Geolapidary Museum. Geode Kid web site. Rockhounds from all over enjoy this collection. Mr. Colburn has dedicated his life to the study of these geologic formations and is responsible for scientific redefinition of previously held “truths”.

Thunderegg is a Native American name for what Geologists call lithophysae or spherulites. Geode simply means an earth shaped hollow rock, or more specifically, a hollow Nodule with a crystal lined cavity.

When nodules are opened they may be simple or complex. While there is usually a “family resemblance” in Nodules and Geodes from a specific area, the best way to reveal the inner mystery is by opening the rock. You may become a Rockhound “wannabe” after seeing this incredible collection. You may have the sudden urge to become a detective unearthing (pun intended) the secrets of rock formation over centuries.

The specimens on display are the best from over 100 locations and were selected from tens of thousands of cuts made over 46 years of collecting. Each flawless specimen was chosen to typify the area where it was mined.

This collection provides a rare opportunity to view one-of-a-kind gifts of nature created over thousands of years. If your family or group includes a rock collector (rockhound), a future geology professor, or anyone who is marvels at the wonders that have been created in the millions years of earth formation, this is a sure hit for your visit

If you just can't wait until you get here or want to study ahead, here are a few online references to consider:Geode Kid web site

Source of Information and photography: The Formation of Thunder Eggs (Lithophysae) by Paul Colburn